diff --git a/src/main/java/flipnote/user/infrastructure/config/AppConfig.java b/src/main/java/flipnote/user/infrastructure/config/AppConfig.java
index 90b7f0d..91213ef 100644
--- a/src/main/java/flipnote/user/infrastructure/config/AppConfig.java
+++ b/src/main/java/flipnote/user/infrastructure/config/AppConfig.java
@@ -1,5 +1,10 @@
 package flipnote.user.infrastructure.config;
 
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.concurrent.Executor;
+
+import org.springframework.boot.jackson.autoconfigure.JsonMapperBuilderCustomizer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
@@ -7,29 +12,40 @@
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.web.client.RestClient;
 
-import java.util.concurrent.Executor;
+import tools.jackson.databind.ext.javatime.ser.LocalDateTimeSerializer;
+import tools.jackson.databind.module.SimpleModule;
 
 @Configuration
 public class AppConfig {
 
-    @Bean
-    public PasswordEncoder passwordEncoder() {
-        return new BCryptPasswordEncoder();
-    }
-
-    @Bean
-    public RestClient restClient() {
-        return RestClient.create();
-    }
-
-    @Bean(name = "taskExecutor")
-    public Executor taskExecutor() {
-        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
-        executor.setCorePoolSize(4);
-        executor.setMaxPoolSize(16);
-        executor.setQueueCapacity(100);
-        executor.setThreadNamePrefix("async-");
-        executor.initialize();
-        return executor;
-    }
+	@Bean
+	public JsonMapperBuilderCustomizer jacksonCustomizer() {
+		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+		return builder -> {
+			SimpleModule module = new SimpleModule();
+			module.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(formatter));
+			builder.addModule(module);
+		};
+	}
+
+	@Bean
+	public PasswordEncoder passwordEncoder() {
+		return new BCryptPasswordEncoder();
+	}
+
+	@Bean
+	public RestClient restClient() {
+		return RestClient.create();
+	}
+
+	@Bean(name = "taskExecutor")
+	public Executor taskExecutor() {
+		ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
+		executor.setCorePoolSize(4);
+		executor.setMaxPoolSize(16);
+		executor.setQueueCapacity(100);
+		executor.setThreadNamePrefix("async-");
+		executor.initialize();
+		return executor;
+	}
 }
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 8ed9735..4525aea 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -2,10 +2,6 @@ spring:
   application:
     name: user
 
-  jackson:
-    date-format: yyyy-MM-dd HH:mm:ss
-    serialization:
-      write-dates-as-timestamps: false
 
   datasource:
     url: ${DB_URL:jdbc:mysql://localhost:3306/flipnote_user}